It sells for about 20 yuan per pound, and the cost is about 30 yuan for one and a half years.

Introduction to breeding

Selection of breeding farms

The water temperature of the breeding pond is required to be above 4℃ in winter and no more than 20℃ in summer. Rainbow trout can eat and grow every year. . The pond should be a flowing pond with fresh water quality, high transparency, sufficient oxygen content, and no toxic or harmful substances in the water.

Construction of breeding farms

Mountain streams, springs, groundwater, bottom drainage of deep water reservoirs or river water with low water temperature and high transparency can be used as water supply sources for rainbow trout farms. . Build a dam on the upper water source to raise the water level and form a drop in the water flow to maintain a sufficient flow rate for the pond water supply. Pond filling, especially on intensive farms, should be independent. The pond can be round, oval, rectangular or ditch-shaped, but an extended rectangle is better, with a width-to-length ratio of 1:4 to 1:5 to prevent dead corners in the pond where water flow stagnates. The width of the pond should not be too large. The width of the juvenile fish pond is mostly 1.5 to 2 meters, and the width of the adult fish pond is mostly 4 to 5 meters. The bottom of the pond is required to have a certain slope and drop, 0.2 is appropriate for the juvenile fish pond and 0.8 for the adult fish pond, which is convenient for drainage, sewage discharge and fishing. The pond can be an earthen pond or a cement pond, and the bank of the pond should be 20 cm to 30 cm above the water surface. The juvenile fish pond is generally 30 square meters to 90 square meters, and the adult fish pond is 100 square meters to 200 square meters.

Raising of juveniles and current year fish

Newly floated juveniles have poor feeding ability and do not cluster together. When starting feeding, attention should be paid to spreading the bait all over the water surface. After two weeks of feeding, the feed can be spread to areas with more fish. The more commonly used feeds for juvenile fish include egg yolks, livestock livers, fresh fish meat, dried water fleas or brewer's yeast, etc. At present, artificial feeds are mostly used. When feeding animal feed, the feed must be finely minced or chopped into a paste and spread on the upper water surface of the pond for fish to ingest. You can also spread the paste-like feed on a fine wire mesh and hang it in the pond for fish to eat. In the later stage, when the juvenile fish are getting bigger, several feeds can be mixed into a paste and cooked, then made into small pellets and sprinkled into the water. Feed compound feed with a particle size of 0.3 mm to 0.5 mm in the early stage and more than 1 mm in the later stage. The amount of animal protein in feed is higher than that of plant protein. As the juvenile fish grow, the plant protein content can be appropriately increased. In the early stage, the feeding times per day need to be more, 6 to 8 times a day is appropriate, and in the later stage, the feeding times are 2 to 4 times a day. Generally, when the water temperature is above 10°C and the body length of juvenile fish is less than 13 cm, the dry feed should be fed at 2 to 7% of the fish's weight, and the fresh feed should be fed at 2.5 to 13% of the fish's body weight. When the body length is more than 14 cm, the dry feed should be fed at 0.5 to 2.4 of the fish's body weight, and the fresh feed should be fed at 1.0 to 4.9 of the fish's body weight.

The initial stocking density of juvenile fish is 5,000 fish/square meter to 10,000 fish/square meter. When the weight of juvenile fish reaches about 1 gram (full length 4 cm to 5 cm), they need to be raised in separate pools according to individual size. The stocking density of fish of about 2 grams (total length 5.5 cm) is 1,200 fish/square meter to 1,500 fish/square meter. After 5 months, fish weighing 20 to 30 grams should be stocked at a density of 500 fish/square meter to 100 fish/square meter.

Adult fish rearing

Internationally, rainbow trout generally have a tail weight of 150 grams to 300 grams as the market size. The fish tail weighs 60 to 70 grams, and the stocking density is 230 fish/square meter to 250 fish/square meter; the fish tail weighs 100 to 150 grams, and the stocking density is 100 fish/square meter to 150 fish/square meter. At the same time, the water flow rate should be increased as the water temperature increases.

Most adult fish breeding ponds are rectangular, with a length-to-width ratio of 10:1, an area of ??100 square meters to 200 square meters, and a pond bottom slope of 0.8. The average flow rate of the pool water should be greater than 2 cm/s, generally between 3 cm/s and 5 cm/s. The dissolved oxygen content should not be less than 5 mg/L, and the ammonia nitrogen should not exceed 1 mg/L. Regularly remove sediment from the bottom of the pool, drain the pool water, and wash the pool. For high-density breeding, it is necessary to artificially increase oxygen and feed nutritious and high-quality feed.